another 360/408 over heating

Inertia, I would agree with you 100%. The problem with that is that I was just pulling out from a stop sign and probably never went over 3K. I had already pulled out at least 8 -10 times on my drive without issue and each time I pulled out I would go thru the gears and would probably run to 3.5-4 K before shifting since its manual shift. There is no doubt that I should have gone with a 1/2" spacer instead of the 1" spacer for clearance. And I should have used the original fan instead of the flex fan. I wont make that mistake again.
I didnt order a radiator today but will probably do it on Monday since I cant work on it again until next week some time. Looks like Im going to go with the larger 2 row radiator. So many here have said they will better cool then the 3 row will.
Lastly yes I measured and I have just 2.5" at best. That means the clutch will not fit. Ive said that at least 3 times during this tread. Even with 2.75" clearance that would be way to tight! But yes its not a guess.
Thanks Rod